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# In a room filled with 7 people, 4 people have exactly 1

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SVP
Joined: 21 Jul 2006
Posts: 1538
Followers: 8

Kudos [?]: 580 [0], given: 1

In a room filled with 7 people, 4 people have exactly 1 [#permalink]

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24 Nov 2007, 09:49
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In a room filled with 7 people, 4 people have exactly 1 friend in the room and 3 people have exactly 2 friends in the room (Assuming that friendship is a mutual relationaship, i.e. if John is Peter's friend, Peter is John'd friend). If two individuals are selected from the room at random, what is the probability that those two individuals are NOT friend?

a) 5/21
b) 3/7
c) 4/7
d) 5/7
e) 16/21
CEO
Joined: 17 Nov 2007
Posts: 3580
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 485

Kudos [?]: 2804 [0], given: 359

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24 Nov 2007, 09:55
Expert's post
SVP
Joined: 21 Jul 2006
Posts: 1538
Followers: 8

Kudos [?]: 580 [0], given: 1

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24 Nov 2007, 10:41
that was great....thanks
[#permalink] 24 Nov 2007, 10:41
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# In a room filled with 7 people, 4 people have exactly 1

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